:root {
    /* vars */

    --hue1: 255;
    --hue2: 222;
    --border: 1px;
    --border-color: hsl(var(--hue2), 12%, 20%);
    --radius: 22px;

    --ease: cubic-bezier(0.5, 1, 0.89, 1);
}

#menu {
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    transition-property: visibility, opacity, filter;
    transition-duration: 0s, 0.25s, 0.25s, 0.25s;
    transition-delay: 0.5s, 0s, 0s, 0s;
    transition-timing-function: var(--ease);
    filter: blur(4px);

    font-family: 'Asap', sans-serif;
    color: #737985;

    position: fixed;
    top: 140px;
    left: 2svw;
    min-width: 275px;
    min-height: 275px;
    border-radius: var(--radius);
    border: var(--border) solid var(--border-color);
    padding: 1em;
    background: linear-gradient(235deg, hsl(var(--hue1) 50% 10% / 0.8), hsl(var(--hue1) 50% 10% / 0) 33%), linear-gradient(45deg, hsl(var(--hue2) 50% 10% / 0.8), hsl(var(--hue2) 50% 10% / 0) 33%), linear-gradient(hsl(220deg 25% 4.8% / 0.66));
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    box-shadow: hsl(var(--hue2) 50% 2%) 0px 10px 16px -8px, hsl(var(--hue2) 50% 4%) 0px 20px 36px -14px;
}

#menu:not(.open)::before,
#menu:not(.open)::after,
#menu:not(.open) .glow {
    opacity: 0;
    pointer-events: none;
    -webkit-animation: glowoff 0.25s var(--ease) both;
    animation: glowoff 0.25s var(--ease) both;
}


#menu.open {

    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transition-delay: 0s;
    filter: blur(0px);

    &::before,
    &::after,
    & .glow,
    & .shine {
        -webkit-animation: glow 1s var(--ease) both;
        animation: glow 1s var(--ease) both;
    }

    & .shine {
        -webkit-animation-delay: 0s;
        animation-delay: 0s;
        -webkit-animation-duration: 2s;
        animation-duration: 2s;
    }

    & .glow {
        -webkit-animation-delay: 0.2s;
        animation-delay: 0.2s;
    }

    & .glow-bright {
        -webkit-animation-delay: 0.1s;
        animation-delay: 0.1s;
        -webkit-animation-duration: 1.5s;
        animation-duration: 1.5s;
    }

    & .shine-bottom {
        -webkit-animation-delay: 0.1s;
        animation-delay: 0.1s;
        -webkit-animation-duration: 1.8s;
        animation-duration: 1.8s;
    }

    & .glow-bottom {
        -webkit-animation-delay: 0.3s;
        animation-delay: 0.3s;
    }

    & .glow-bright.glow-bottom {
        -webkit-animation-delay: 0.3s;
        animation-delay: 0.3s;
        -webkit-animation-duration: 1.1s;
        animation-duration: 1.1s;
    }
}

#menu .shine,
#menu .glow {
    --hue: var(--hue1);
}

#menu .shine-bottom,
#menu .glow-bottom {
    --hue: var(--hue2);
    --conic: 135deg;
}

#menu .shine {
}

#menu .shine,
#menu .shine::before,
#menu .shine::after {

    pointer-events: none;

    border-radius: 0;
    border-top-right-radius: inherit;
    border-bottom-left-radius: inherit;
    border: 1px solid transparent;

    width: 75%;
    height: auto;
    min-height: 0px;
    aspect-ratio: 1;
    display: block;
    position: absolute;
    right: calc(var(--border) * -1);
    top: calc(var(--border) * -1);
    left: auto;

    z-index: 1;

    --start: 12%;
    background: conic-gradient(
            from var(--conic, -45deg) at center in oklch,
            transparent var(--start, 0%), hsl(var(--hue), var(--sat, 80%), var(--lit, 60%)), transparent var(--end, 50%)
    ) border-box;

    -webkit-mask: linear-gradient(transparent),
    linear-gradient(black);

    mask: linear-gradient(transparent),
    linear-gradient(black);
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-clip: padding-box, border-box;
    mask-clip: padding-box, border-box;
    -webkit-mask-composite: source-out;
    mask-composite: subtract;

}

#menu .shine::before,
#menu .shine::after {
    content: "";
    width: auto;
    inset: -2px;
    -webkit-mask: none;
    mask: none;
}

#menu .shine::after {
    z-index: 2;
    --start: 17%;
    --end: 33%;
    background: conic-gradient(
            from var(--conic, -45deg) at center in oklch,
            transparent var(--start, 0%), hsl(var(--hue), var(--sat, 80%), var(--lit, 85%)), transparent var(--end, 50%)
    );

}

#menu .shine-bottom {
    top: auto;
    bottom: calc(var(--border) * -1);
    left: calc(var(--border) * -1);
    right: auto;
}

#menu .glow {

    pointer-events: none;

    border-top-right-radius: calc(var(--radius) * 2.5);
    border-bottom-left-radius: calc(var(--radius) * 2.5);
    border: calc(var(--radius) * 1.25) solid transparent;
    inset: calc(var(--radius) * -2);

    width: 75%;
    height: auto;
    min-height: 0px;
    aspect-ratio: 1;
    display: block;
    position: absolute;
    left: auto;
    bottom: auto;

    -webkit-mask: url('https://assets.codepen.io/13471/noise-base.png');

    mask: url('https://assets.codepen.io/13471/noise-base.png');
    mask-mode: luminance;
    -webkit-mask-size: 29%;
    mask-size: 29%;

    opacity: 1;
    filter: blur(12px) saturate(1.25) brightness(0.5);
    mix-blend-mode: plus-lighter;
    z-index: 3;

    &.glow-bottom {
        inset: calc(var(--radius) * -2);
        top: auto;
        right: auto;
    }

    &::before,
    &::after {
        content: "";
        position: absolute;
        inset: 0;
        border: inherit;
        border-radius: inherit;
        background: conic-gradient(
                from var(--conic, -45deg) at center in oklch,
                transparent var(--start, 0%), hsl(var(--hue), var(--sat, 95%), var(--lit, 60%)), transparent var(--end, 50%)
        ) border-box;
        -webkit-mask: linear-gradient(transparent),
        linear-gradient(black);
        mask: linear-gradient(transparent),
        linear-gradient(black);
        -webkit-mask-repeat: no-repeat;
        mask-repeat: no-repeat;
        -webkit-mask-clip: padding-box, border-box;
        mask-clip: padding-box, border-box;
        -webkit-mask-composite: source-out;
        mask-composite: subtract;
        filter: saturate(2) brightness(1);

    }

    &::after {
        --lit: 70%;
        --sat: 100%;
        --start: 15%;
        --end: 35%;
        border-width: calc(var(--radius) * 1.75);
        border-radius: calc(var(--radius) * 2.75);
        inset: calc(var(--radius) * -0.25);
        z-index: 4;
        opacity: 0.75;
    }

    &.glow-bottom::after {
    }

}

#menu .glow-bright {

    --lit: 80%;
    --sat: 100%;
    --start: 13%;
    --end: 37%;

    border-width: 5px;
    border-radius: calc(var(--radius) + 2px);
    inset: -7px;
    left: auto;
    filter: blur(2px) brightness(0.66);

    &::after {
        content: none;
    }

    &.glow-bottom {
        inset: -7px;
        right: auto;
        top: auto;
    }
}

#menu .inner,
#menu section {
    display: flex;
    flex-direction: column;
    gap: 0.5em;
}

#menu .inner {
    font-size: 0.875rem;
}

#menu hr {
    width: 100%;
    height: 0.5px;
    background: var(--border-color);
    border: none;
    margin: 0.25em 0 0.5em;
    opacity: 0.66;
}

#menu input {
    --tint2: hsl(var(--hue2) 50% 90% / 0.1);
    font-family: 'Asap', sans-serif;
    font-weight: 300;
    box-shadow: 0 0 0 1px transparent;
    border: 1px solid hsl(var(--hue2) 13% 18.5% / 0.5);
    background: hsl(var(--hue1) 0% 40% / 0.05);
    border-radius: calc(var(--radius) * 0.33333);
    padding-left: 2.33em;
}

#menu label {
    display: grid;
    grid-template: 1fr/1fr;
    margin-bottom: 1em;
    width: 100%;

    & > * {
        grid-area: 1/1;
        align-self: center;
    }

    & svg {
        margin-left: 0.5em;
        opacity: 0.5;
    }
}

#menu header {
    font-size: 0.75rem;
    font-weight: 300;
    padding: 0 0.66em;
}

#menu ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#menu li {
    position: relative;
    padding: 0.66em;
    height: 32px;
    display: flex;
    align-items: center;
    gap: 0.5em;
    border-radius: calc(var(--radius) * 0.33333);
    border: 1px solid transparent;
    transition: all 0.3s ease-in, --item-opacity 0.3s ease-in;
    background: linear-gradient(
            90deg in oklch,
            hsl(var(--hue1) 29% 13% / var(--item-opacity)),
            hsl(var(--hue1) 30% 15% / var(--item-opacity)) 24% 32%,
            hsl(var(--hue1) 5% 7% / var(--item-opacity))
    ) border-box;

    &::after {
        content: "";
        position: absolute;
        inset: 0;
        border-radius: inherit;
        border: inherit;
        background: linear-gradient(
                90deg in oklch,
                hsl(var(--hue1) 15% 16% / var(--item-opacity)),
                hsl(var(--hue1) 40% 24% / var(--item-opacity)) 20% 32%,
                hsl(var(--hue1) 2% 12% / var(--item-opacity))
        ) border-box;
        -webkit-mask: linear-gradient(transparent),
        linear-gradient(black);
        mask: linear-gradient(transparent),
        linear-gradient(black);
        -webkit-mask-repeat: no-repeat;
        mask-repeat: no-repeat;
        -webkit-mask-clip: padding-box, border-box;
        mask-clip: padding-box, border-box;
        -webkit-mask-composite: source-out;
        mask-composite: subtract;
    }

    &:hover,
    &.selected,
    &:hover::after,
    &.selected::after {
        --item-opacity: 0.5;
        transition: all 0.1s ease-out, --item-opacity 0.1s ease-out;
        color: white;
    }

    &.selected,
    &.selected::after {
        -webkit-animation: flash 0.75s ease-out 1 forwards;
        animation: flash 0.75s ease-out 1 forwards;
    }
}

@property --item-opacity {
    syntax: "<number>";
    inherits: false;
    initial-value: 0;
}


body {
    background: #08090d;
    background-image: url(https://assets.codepen.io/13471/abstract-light.jpg), linear-gradient(to right in oklab, hsl(var(--hue2) 50% 75%), hsl(var(--hue1) 50% 75%));
    background-size: cover;
    background-position: center;
    background-blend-mode: hard-light;
    padding: 0;
}

body, #app {
    min-height: 100svh;
}

#app {
    padding: 2svw;
}

#app > header {
    display: flex;
    gap: 0.5em;
    flex-direction: column;
}

#app > header h1,
#app > header p {
    margin: 0;
    color: color-mix(in oklab, var(--fg) 70%, hsl(var(--hue1) 50% 50%));
}

#app > header p {
    color: color-mix(in oklab, var(--fg) 40%, hsl(var(--hue2) 50% 50%));
}

#app > footer {
    align-self: end;
    max-width: calc(96svw - 200px);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5em;
}

#app > footer h2 {
    width: 100%;
    font-size: 1em;
}

#app > footer [type=range] {
    --tint: hsl(var(--hue2) 66% 50%);
    --tint2: hsl(var(--hue1) 66% 50%);
    width: 320px;
    margin: 0;
}

#app > footer #h1 {
    --tint: hsl(var(--hue1) 66% 50%);
    --tint2: hsl(var(--hue1) 66% 50%);
    --hue: var(--hue1);
    width: 320px;
}

#app > footer #h2 {
    --tint: hsl(var(--hue2) 66% 50%);
    --tint2: hsl(var(--hue2) 66% 50%);
    --hue: var(--hue2);
    width: 320px;
}

@media screen and (max-width: 480px) {
    #app > footer {
        gap: 1em;
    }
}

#app input[type="range"]::-webkit-slider-thumb {
    box-shadow: 0 1px 2px 1px hsl(var(--hue) 66% 20% / 0.5);
}

#app input[type="range"]::-moz-range-thumb {
    box-shadow: 0 1px 2px 1px hsl(var(--hue) 66% 20% / 0.5);
}

#app input[type="range"]::-ms-thumb {
    box-shadow: 0 1px 2px 1px hsl(var(--hue) 66% 20% / 0.5);
}

#menu svg {
    fill: none;
    stroke-width: 1;
    height: 20px;
}


@-webkit-keyframes glow {
    0% {
        opacity: 0;
    }
    3% {
        opacity: 1;
    }
    10% {
        opacity: 0;
    }
    12% {
        opacity: 0.7;
    }
    16% {
        opacity: 0.3;
        -webkit-animation-timing-function: var(--ease);
        animation-timing-function: var(--ease);
    }
    100% {
        opacity: 1;
        -webkit-animation-timing-function: var(--ease);
        animation-timing-function: var(--ease);
    }
}


@keyframes glow {
    0% {
        opacity: 0;
    }
    3% {
        opacity: 1;
    }
    10% {
        opacity: 0;
    }
    12% {
        opacity: 0.7;
    }
    16% {
        opacity: 0.3;
        -webkit-animation-timing-function: var(--ease);
        animation-timing-function: var(--ease);
    }
    100% {
        opacity: 1;
        -webkit-animation-timing-function: var(--ease);
        animation-timing-function: var(--ease);
    }
}

@-webkit-keyframes glowoff {
    to {
        opacity: 0;
    }
}

@keyframes glowoff {
    to {
        opacity: 0;
    }
}

@-webkit-keyframes flash {
    0% {
        opacity: 0;
        --item-opacity: 0;
    }
    7% {
        opacity: 0.5;
        --item-opacity: 1;
    }
    14% {
        opacity: 0;
        --item-opacity: 0.5;
    }
    21%, 100% {
        opacity: 1;
        --item-opacity: 1;
    }
}

@keyframes flash {
    0% {
        opacity: 0;
        --item-opacity: 0;
    }
    7% {
        opacity: 0.5;
        --item-opacity: 1;
    }
    14% {
        opacity: 0;
        --item-opacity: 0.5;
    }
    21%, 100% {
        opacity: 1;
        --item-opacity: 1;
    }
}